Composite negative electrode, preparation method of negative electrode and lithium-sulfur secondary battery with negative electrode

A lithium-sulfur secondary battery and battery negative electrode technology, which is applied in the manufacture of battery electrodes, lithium batteries, electrolyte batteries, etc., can solve the problems of sacrificing high-power discharge of secondary batteries, increasing battery internal resistance, etc., and achieve long-lasting user experience, The effect of high energy density

Active Publication Date: 2014-12-24
GENERAL ELECTRONICS BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In essence, this technology reduces the growth of lithium dendrites by reducing the porosity of the separator, but it greatly

Method used

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  • Composite negative electrode, preparation method of negative electrode and lithium-sulfur secondary battery with negative electrode
  • Composite negative electrode, preparation method of negative electrode and lithium-sulfur secondary battery with negative electrode
  • Composite negative electrode, preparation method of negative electrode and lithium-sulfur secondary battery with negative electrode

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Embodiment Construction

[0040] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] combine Figure 2 to Figure 4 , the composite negative electrode according to the embodiment of the present invention includes: copper foil 11 and solid lithium ion conductive separator belt 12 . Of course, the copper foil 11 can also be replaced by other metals, and no example is given here.

[0042] Among them, one end of the copper foil 11 is provided with a tab 111 for conducting current. The overall shape of the tab 111 and the copper foil 11 is similar to a kitchen knife, and the tab 111 is similar to a knife handle. Usually, the tab 111 and the copper foil 11 are an integral structure. Formed, or integrally formed by punching, casting, etc.

[0043] Moreover, at least one side of the copper foil 11 is closely provided with a metal lithium foil 112 or an alloy lithium foil as the negative electrode 10 of the battery, except that the tab...

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Abstract

The invention discloses a composite negative electrode, a preparation method of the negative electrode and a lithium-sulfur secondary battery with the negative electrode. The composite negative electrode comprises copper foil and a solid lithium ion conductive diaphragm tape, wherein one end of the copper foil is provided with a tab for conducting current, at least one side of the copper foil is closely provided with metal lithium foil or alloy lithium foil which is used as a battery negative electrode, and the solid lithium ion conductive diaphragm tape covers the battery negative electrode, so that the accumulation of lithium ions on a negative electrode lithium alloy surface and the short circuit, caused by lithium dendrites, between a positive electrode and the negative electrode of the battery can be prevented. In the manner, on the premise of maintaining high energy density, the safety performance of the lithium-sulfur battery can be improved. In addition, multi-element compound electrolyte is used for substituting for organic electrolyte, so that the dissolving and diffusion of sulfur in the electrolyte can be effectively prevented, and the cycling life of the battery can be greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a composite negative electrode for lithium-sulfur secondary batteries, a preparation method and the lithium-sulfur secondary battery. Background technique [0002] Since John Goodenough, a professor at the University of Texas in 1979, invented lithium compounds (such as lithium cobaltate, lithium nickelate and lithium manganate, etc.) as positive electrode materials for secondary batteries, global battery companies have started production of lithium metal secondary batteries. and sales history. [0003] Lithium metal secondary batteries at that time used lithium foil as the negative electrode, a lithium compound as the positive electrode, and an organic liquid solution as the electrolyte. However, when the battery is being charged, lithium metal accumulation and lithium dendritic growth occur on the surface of the lithium foil negative electrode, resulting in a short...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M2/14H01M4/1395H01M10/052H01M10/058
CPCH01M4/134H01M4/1395H01M10/052H01M10/058H01M50/572Y02E60/10Y02P70/50
Inventor 赵军辉
Owner GENERAL ELECTRONICS BATTERY CO LTD
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